<?php	
	$f	= $params[0];
	$v		= $_GET["{$f}"];
	$sql	= "SELECT * FROM `tbl_member` WHERE `$f` = '$v' LIMIT 1";
	$query = mysql_query($sql);
	while($result = mysql_fetch_assoc($query)){
		die("false");
	}
	mysql_free_result($query);
	echo "true";
	exit;
?>